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        <p>&emsp;&emsp;最近在使用<a href="http://dubbo.apache.org/" target="_blank" rel="noopener">Dubbo</a>做分布式系统RPC的通信，所以觉得有必要了解一下Dubbo的整体架构和源码。Dubbo是阿里巴巴开源贡献给Apache的一款高性能Java RPC框架，注意它是一个RPC框架，之前面试发现总有人问Dubbo和Spring Cloud的区别，很令人不解，两个不同层面的东西有什么好比较的。<br><a id="more"></a></p>
<h3 id="项目概览"><a href="#项目概览" class="headerlink" title="项目概览"></a>项目概览</h3><p>&emsp;&emsp;<a href="https://github.com/apache/dubbo" target="_blank" rel="noopener">Dubbo源码</a>使用master分支作为主干版本的开发，使用tag作为版本构建的标签，以下所有源码信息源于master分支，tag是dubbo-2.7.7。下载Dubbo源码之后就可以看到很多子模块，初看可能不是很明白，不过幸好<a href="http://dubbo.apache.org/zh-cn/docs/dev/design.html" target="_blank" rel="noopener">Dubbo官方文档框架设计</a>这一篇有对于整个架构设计以及模块分层的说明，大致阅读之后就能明白，可以依此作为源码阅读的起点。下面着重列举一下几个模块：</p>
<h4 id="dubbo-cluster-路由层"><a href="#dubbo-cluster-路由层" class="headerlink" title="dubbo-cluster 路由层"></a>dubbo-cluster 路由层</h4><blockquote>
<p>封装多个提供者的路由及负载均衡，并桥接注册中心，以 Invoker 为中心，扩展接口为Cluster, Directory, Router, LoadBalance</p>
</blockquote>
<p>以上是<strong>dubbo-cluster</strong>的官方解释，贴一张项目图<img src="/2020/07/07/Dubbo之旅（一）Hello-Dubbo/dubbo-cluster.jpg" alt></p>
<h4 id="duubo-common-公共模块"><a href="#duubo-common-公共模块" class="headerlink" title="duubo-common 公共模块"></a>duubo-common 公共模块</h4><p>封装一些公用的Util和模型。这个模块结构单一，就不贴图了。</p>
<h4 id="dubbo-config-配置模块"><a href="#dubbo-config-配置模块" class="headerlink" title="dubbo-config 配置模块"></a>dubbo-config 配置模块</h4><blockquote>
<p>config 配置层：对外配置接口，以 ServiceConfig, ReferenceConfig 为中心，可以直接初始化配置类，也可以通过 spring 解析配置生成配置类。</p>
</blockquote>
<p>提供dubbo的四种配置方式，包括XML、属性、API、注解。模块结构比较简单，也不贴图了。</p>
<h4 id="dubbo-configcenter-配置中心"><a href="#dubbo-configcenter-配置中心" class="headerlink" title="dubbo-configcenter 配置中心"></a>dubbo-configcenter 配置中心</h4><p>配置中心的具体实现，目前有apollo、consul、etcd、nacos、zookeeper。项目图<img src="/2020/07/07/Dubbo之旅（一）Hello-Dubbo/dubbo-config.jpg" alt>。</p>
<h4 id="dubbo-container-容器模块"><a href="#dubbo-container-容器模块" class="headerlink" title="dubbo-container 容器模块"></a>dubbo-container 容器模块</h4><blockquote>
<p>是一个 Standlone 的容器，以简单的 Main 加载 Spring 启动，因为服务通常不需要 Tomcat/JBoss 等 Web 容器的特性，没必要用 Web 容器去加载服务。</p>
</blockquote>
<p>主要是提供一个Main启动给服务容器，项目结构比较简单，省略图。</p>
<h4 id="dubbo-metadata-元数据存储模块"><a href="#dubbo-metadata-元数据存储模块" class="headerlink" title="dubbo-metadata 元数据存储模块"></a>dubbo-metadata 元数据存储模块</h4><p>元数据指的是描述数据的数据，在dubbo中，元数据包括服务接口，及接口的方法信息。除了元数据以外，dubbo provider和consumer配置项众多，有些数据不需要透传给对方，为了让注册中心保持轻量，减少网络开销，使用单独的key value存储中心来存储。具体的元数据中心介绍也可以参考<a href="https://dubbo.apache.org/zh-cn/docs/user/references/metadata/introduction.html" target="_blank" rel="noopener">元数据中心参考手册</a><br>remoting项目结构如下<img src="/2020/07/07/Dubbo之旅（一）Hello-Dubbo/dubbo-metadata.jpg" alt></p>
<h4 id="dubbo-monitor-监控模块"><a href="#dubbo-monitor-监控模块" class="headerlink" title="dubbo-monitor 监控模块"></a>dubbo-monitor 监控模块</h4><p>用于检测服务健康，这个模块的内容比较少，主要由：</p>
<ul>
<li><strong>dubbo-monitor-api</strong>：定义monitor相关的接口、工厂、以及过滤器</li>
<li><strong>dubbo-monitor-default</strong>：实现了监控相关。</li>
</ul>
<h4 id="dubbo-registry-注册中心模块"><a href="#dubbo-registry-注册中心模块" class="headerlink" title="dubbo-registry 注册中心模块"></a>dubbo-registry 注册中心模块</h4><p>整个注册中心模块如下：<img src="/2020/07/07/Dubbo之旅（一）Hello-Dubbo/dubbo-registry.jpg" alt><br>其中<strong>dubbo-registry-api</strong>是注册中心抽象模块，其他模块则是各种注册中心的实现。其实上面很多模块也是类似的设计方式，从中我们或许可以学习到一些关于结构抽象方面的能力，便于解耦和扩展。注册中心各个实现模块详情具体也可以参考<a href="https://dubbo.apache.org/zh-cn/docs/user/references/registry/introduction.html" target="_blank" rel="noopener">注册中心参考手册</a></p>
<h4 id="dubbo-remoting-远程通讯模块"><a href="#dubbo-remoting-远程通讯模块" class="headerlink" title="dubbo-remoting 远程通讯模块"></a>dubbo-remoting 远程通讯模块</h4><p>这个模块主要是实现网络通信数据传输相关方面的功能，这对于一款RPC框架的来说也是必不可少的地方，remoting项目结构如下<img src="/2020/07/07/Dubbo之旅（一）Hello-Dubbo/dubbo-remoting.jpg" alt><br>从上面几个模块的介绍可以大致看出dubbo的设计风格，api抽象为一个模块，其他实现各自独立，结合SPI使用，可以保持整个领域单元的高内聚低耦合。</p>
<h4 id="dubbo-rpc-远程调用模块"><a href="#dubbo-rpc-远程调用模块" class="headerlink" title="dubbo-rpc 远程调用模块"></a>dubbo-rpc 远程调用模块</h4><p>基于远程通讯模块，Dubbo封装了自己的协议，以及实现了其他框架的一些协议，RPC模块项目结构如下<img src="/2020/07/07/Dubbo之旅（一）Hello-Dubbo/dubbo-rpc.jpg" alt><br>整个RPC模块的项目结构是同样的配方同样的味道，依然以api为高度抽象，关于Dubbo的协议或者其他框架的协议兼容，可以参考<a href="https://dubbo.apache.org/zh-cn/docs/user/references/protocol/introduction.html" target="_blank" rel="noopener">协议参考手册</a></p>
<h4 id="dubbo-serialization-序列化模块"><a href="#dubbo-serialization-序列化模块" class="headerlink" title="dubbo-serialization 序列化模块"></a>dubbo-serialization 序列化模块</h4><p>serialization模块负责数据序列化和反序列化，模块如下模块项目结构如下<img src="/2020/07/07/Dubbo之旅（一）Hello-Dubbo/dubbo-serialization.jpg" alt><br><strong>dubbo-serialization-api</strong>定义了Serialization的接口以及数据输入输出的接口。</p>
<h3 id="最后也是起点"><a href="#最后也是起点" class="headerlink" title="最后也是起点"></a>最后也是起点</h3><p>&emsp;&emsp;以上列出了一些dubbo比较重点的模块，然后后续也会从这几个模块中入手，开始学习Dubbo的一些框架设计和原理。</p>

      
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-3"><a class="nav-link" href="#项目概览"><span class="nav-number">1.</span> <span class="nav-text">项目概览</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#dubbo-cluster-路由层"><span class="nav-number">1.1.</span> <span class="nav-text">dubbo-cluster 路由层</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#duubo-common-公共模块"><span class="nav-number">1.2.</span> <span class="nav-text">duubo-common 公共模块</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#dubbo-config-配置模块"><span class="nav-number">1.3.</span> <span class="nav-text">dubbo-config 配置模块</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#dubbo-configcenter-配置中心"><span class="nav-number">1.4.</span> <span class="nav-text">dubbo-configcenter 配置中心</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#dubbo-container-容器模块"><span class="nav-number">1.5.</span> <span class="nav-text">dubbo-container 容器模块</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#dubbo-metadata-元数据存储模块"><span class="nav-number">1.6.</span> <span class="nav-text">dubbo-metadata 元数据存储模块</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#dubbo-monitor-监控模块"><span class="nav-number">1.7.</span> <span class="nav-text">dubbo-monitor 监控模块</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#dubbo-registry-注册中心模块"><span class="nav-number">1.8.</span> <span class="nav-text">dubbo-registry 注册中心模块</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#dubbo-remoting-远程通讯模块"><span class="nav-number">1.9.</span> <span class="nav-text">dubbo-remoting 远程通讯模块</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#dubbo-rpc-远程调用模块"><span class="nav-number">1.10.</span> <span class="nav-text">dubbo-rpc 远程调用模块</span></a></li><li class="nav-item nav-level-4"><a class="nav-link" href="#dubbo-serialization-序列化模块"><span class="nav-number">1.11.</span> <span class="nav-text">dubbo-serialization 序列化模块</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#最后也是起点"><span class="nav-number">2.</span> <span class="nav-text">最后也是起点</span></a></li></ol></div>
            

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